well it will pull the same amount either way.. if ur sending 450 to each coil, or 900 to both, it will pull the same.. ide just stick mono, for ease of wiring, and if u have settings for each channel it would be tricky..

Also, wiring the coils to two different channels can make the sub tear itself a part. In music sometimes both channels are recieving different notes at the same time. When a sub tries to produce two different sound at the same time it can destroy itself.